Battery amp hour for outboard ?

[phillnjack2]

What size battery is needed for outboard engines with electric start and trim n tilt ?

For example,
I have a 60hp evinrude electric start with trim and my friend has a 140hp with electric start and trim n tilt.

Now both engines will need a certain amount of cold cranking capacity, and both will have their own charging systems on the engines.

But what is the AMP/Hr rating needed for the two different engines, and what cold cranking amps etc.

I need the answer in amp/hr and cold cranking amps, as in the uk this is what is stated on batteries.

not concerned too much about other electricals like lights,bait pumps etc as these are just speedboats with
very little other electric consumption onboard.
Ok both run guages, and a few little bits like simple fish finder and vhf radio's, but thats about it.
No silly sound system to drain battery, and no gimic gizmo's.




phill

 

[MH Hawker]

Re: Battery amp hour for outboard ?

the starter load cranking amps is listed in ther manual for each, as well as its charging amps.

 

[Silvertip]

Re: Battery amp hour for outboard ?

9.9 - 30 HP engines can use a 350 CCA battery
40 - 140 HP engines can use a 360 CCA battery
150 - 300 HP engines require a 500 CCA battery

you can use a battery with a higher CCA rating than specified, but not less than the numbers listed. In other words you can't have too much capacity -- just too little.

 

[phillnjack2]

Re: Battery amp hour for outboard ?

On the optima battery site i found this, and they seem to think much biger capacity is needed,
As you can see below the figures from optima show huge batts needed,
would this be just for the new computerised engines !!!

Here is the Optima chart ..

EVINRUDE
Outboard 25 - 90 hp = 640 - 800 CCA
Outboard 25 - 90 hp = (Extreme Apps)800 - 1000 CCA
Outboard 115 - 250 hp = 675 - 845 CCA
Outboard 115 - 250 hp = (Extreme Apps) 800 - 1000 CCA
extreme apps being very cold temps


Mercury
2-Stroke 6-15, 20/25, 30/40, 40/50 & 60 hp 350- 465 CCA
2-Stroke 75 - 125 hp 450 -525 CCA
4-Stroke 9.9/15 & 25 hp 350- 465 CCA
4-Stroke 30/40, 45/50 hp 350-465 CCA
4-Stroke 30/40, 45/50 hp (Extreme Apps) 750 -1000 CCA
4-Stroke 75/90 350 465 CCA
4-Stroke 75/90 (Extreme Apps) 750 -1000 CCA
V-6 Carb EFI 135/200 & 200/250 hp 490 630 CCA
OptiMax 2.5L/3.0L 750 - 1000 CCA
Verado 135-200hp 800 - 1000 CCA
Verado 200-300hp 800 - 1000 CCA

Suzuki
4-Stroke 25 hp and below 330 - 450 CCA
4-Stroke 40 - 140 hp 512 - 650 CCA
4-Stroke 150 - 250 hp 670 - 850 CCA
4-Stroke 300 hp 800 - 1000 CCA

Yamaha
2-Stroke 50 hp and below 245 -323 CCA
2-Stroke 60 - 150 hp Carbureted 380- 502 CCA
2-Stroke 2.6L 150 - 200 hp EFI 380 -502 CCA
2-Stroke 3.1L 200 - 250 hp EFI 512- 675 CCA
2-Stroke150 - 300 hp HPDI 512 -675 CCA
4-Stroke F25 and below 245 -323 CCA
4-Stroke F30 - F115 380 - 502 CCA
4-Stroke F150 - F250 512- 675 CCA
4-Stroke F350 750 -950 CCA


phill

 

[dingbat]

Re: Battery amp hour for outboard ?

On the optima battery site i found this, and they seem to think much biger capacity is needed,
As you can see below the figures from optima show huge batts needed,
would this be just for the new computerised engines !!!

Here is the Optima chart ..

EVINRUDE
Outboard 25 - 90 hp = 640 - 800 CCA
Outboard 25 - 90 hp = (Extreme Apps)800 - 1000 CCA
Outboard 115 - 250 hp = 675 - 845 CCA
Outboard 115 - 250 hp = (Extreme Apps) 800 - 1000 CCA
extreme apps being very cold temps


Mercury
2-Stroke 6-15, 20/25, 30/40, 40/50 & 60 hp 350- 465 CCA
2-Stroke 75 - 125 hp 450 -525 CCA
4-Stroke 9.9/15 & 25 hp 350- 465 CCA
4-Stroke 30/40, 45/50 hp 350-465 CCA
4-Stroke 30/40, 45/50 hp (Extreme Apps) 750 -1000 CCA
4-Stroke 75/90 350 465 CCA
4-Stroke 75/90 (Extreme Apps) 750 -1000 CCA
V-6 Carb EFI 135/200 & 200/250 hp 490 630 CCA
OptiMax 2.5L/3.0L 750 - 1000 CCA
Verado 135-200hp 800 - 1000 CCA
Verado 200-300hp 800 - 1000 CCA

Suzuki
4-Stroke 25 hp and below 330 - 450 CCA
4-Stroke 40 - 140 hp 512 - 650 CCA
4-Stroke 150 - 250 hp 670 - 850 CCA
4-Stroke 300 hp 800 - 1000 CCA

Yamaha
2-Stroke 50 hp and below 245 -323 CCA
2-Stroke 60 - 150 hp Carbureted 380- 502 CCA
2-Stroke 2.6L 150 - 200 hp EFI 380 -502 CCA
2-Stroke 3.1L 200 - 250 hp EFI 512- 675 CCA
2-Stroke150 - 300 hp HPDI 512 -675 CCA
4-Stroke F25 and below 245 -323 CCA
4-Stroke F30 - F115 380 - 502 CCA
4-Stroke F150 - F250 512- 675 CCA
4-Stroke F350 750 -950 CCA


phill

Yes, most of the newer outboards require significantly more power than in the past. Check your manual for details

 

[Silvertip]

Re: Battery amp hour for outboard ?

A carbureted 60 HP JohnnyRude would be happy as a clam with a 350 CCA as iindicated. But as i said and Bubba did as well, bigger won't hurt anything and is easier and cheaper than a small one in some cases. Of course Optima would like to sell you one of their batteries based on their tables. After all -- it's all about the money. But yes, EFI/DFI engines (2 or 4-stroke) have more electrics to run so the bigger battery is required.

 

[Don S]

Re: Battery amp hour for outboard ?

The big problem with EFI engines isn't the fact that a smaller battery won't turn it over, or a deep cycle battery as well. The real problem is the voltage drop. The ECM's convert the 12V system down to 5 volts operate. When the starter cranks, the engine may be spinning over fine, but if the voltage drops to around 9v or less, the ECM shuts down and you loose fuel pumps, spark, anything controlled by the ECM.
A new battery of the proper size for say a 350 Chevy EFI engine will drop to around 10.5 volts while cranking which is normal. So it's not a huge range of voltage to play with.